Originally Posted By metco:being a novice, i have a rra a3 flat top. just put a rra tac. carry handle on it.will the tac carry sight co-witness with front sight ??? the front sight is standard that comes with a rra a3 flat top.any & all info. appricated. oh my lower hasn't arrived yet, it's hard to check sight co-witness without lower. metco

It will work, but there are better options for BUIS. What are are your requirements for optics? For almost every optics from Aimpoints, EcoTech and ACOGs (and others), the TAC carry sight with rail is not a usable combination. IMHO